Friendship Logic Due Tomorrow!

There is an Omnigraffle file on my Teachers folder that could help you organize your thoughts!

• Put the questions into the boxes;
• Drag the AND and OR connectors into place;
• Explain your logic in the box at the bottom of the page.

You will have a chance to hand this in tomorrow. Spend about half of the class preparing your thoughts and checking with a neighbor to see if it makes sense to them too.

Transformers: An Exploration

Two parts of this simulation will help with the EE chapter: Transformers and Generators. Click to Run, and try them out!

Follow these directions, and answer these questions in your digital notebook.

Generator:

a. Go to: http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Electromagnetic_Lab
b. Click the tab for generator

1. How does a generator generate electrical energy? What energy transformations are taking place?
2. Why does a generator make alternating current? What change would have to be made to make direct current? (Hint a generator that makes direct current is called and alternator…)

Transformer:

a. Go to: http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Electromagnetic_Lab
b. Click the tab for transformer.

1. Describe how the energy from the battery reaches the light bulb.
2. What effect does changing the number of coils or the size of the coils have on the brightness of the light bulb?
3. Describe how this principle could be used to change the voltage of AC current.
4. Explain why this device is not effective when used with DC current. (hint—look at the changes of the magnetic field

Transformers Notes

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